Earth Science - 2c

What is the tilt of earth?

23.5 degrees

Altitude of Polaris = …

Observer’s latitude

What is the major source of energy?

The sun

Radiation

Energy transferred through space or gas

Tropic of Cancer

23.5 degrees North

Sun is directly overhead in June

Tropic of Capricorn

23.5 degrees South

Sun is directly overhead in South

3 reasons for changing seasons

Earth is tilted at 23.5 degrees

Earth revolves around the Sun

Earth’s axis is always pointed toward Polaris but changes direction relative to the Sun

Solstice

The first day of summer and winter when the day is either the longest or shortest

When is the winter and summer solstice?

12/21

6/21

When is the spring and fall equinox?

3/21

9/21

Spring and Fall is located at 0 degrees. What is that 0 degrees representing?

The equator

Duration of Insolation

Amount of energy daylight changes on yearly solar radiation 

Insolation

incoming solar radiation

Angle of Insolation

angle sun rays strike earth’s surface

Intensity of insolation

amount of energy per area

Spring / Fall Equinoxes - where do they rise/noon sun/set

Rise: Due East

Noon Sun: South

Sunset: Due West

Summer Solstice - where do they rise/noon sun/set

Rise: North of East

Noon Sun: South

Sunset: North of west

Winter Solstice - where do they rise/noon sun/set

Rise: South of East

Noon Sun: South

Sunset: South of West

At sunrise and sunset, the angle of insolation is ___ so the length of the shadow is ___

lowest; longest

At solar noon, the angle of insolation is ___ so the length of the shadow is ___

highest; shortest

What is Earth’s rate of roation?

15 degrees

How much degrees does the Earth rotate in 1 day?

360 degrees